takeoff rocket vs takeoff booster

takeoff rocket and takeoff booster both are nouns.

Word	Noun	Adjective	Verb	Adverb
takeoff rocket	Yes	No	No	No
takeoff booster	Yes	No	No	No

As nouns, takeoff rocket and takeoff booster are synonyms defined as:

takeoff rocket and takeoff booster: the first stage of a multistage rocket

Other synonyms of takeoff rocket include booster, booster rocket, booster unit.

takeoff rocket (noun)	takeoff booster (noun)
the first stage of a multistage rocket	the first stage of a multistage rocket